[PATCH RFC 01/11] rust: types: Add Opaque::zeroed()

Asahi Lina
2023-07-14T09:32:22Z

Opaque types are internally MaybeUninit, so it's safe to actually
zero-initialize them as long as we don't claim they are initialized.
This is useful for many FFI types that are expected to be zero-inited by
the user.

Signed-off-by: Asahi Lina <lina@asahilina.net>
---
rust/kernel/types.rs | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs
index 1e5380b16ed5..185d3493857e 100644
--- a/rust/kernel/types.rs
+++ b/rust/kernel/types.rs
@@ -237,6 +237,11 @@ pub const fn uninit() -> Self {
Self(MaybeUninit::uninit())
}

+ /// Creates a zeroed value.
+ pub fn zeroed() -> Self {
+ Self(MaybeUninit::zeroed())
+ }
+
/// Creates a pin-initializer from the given initializer closure.
///
/// The returned initializer calls the given closure with the pointer to the inner `T` of this

--
2.40.1